Breaking Barriers: Causes, Consequences, and Experimental Utility of Human-Mediated Hybridization

Grabenstein, Kathryn C.; Taylor, Scott A.

doi:10.1016/j.tree.2017.12.008

Cited by 172 publications

(179 citation statements)

References 108 publications

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“…Variation in outcomes of hybridization also poses a significant challenge for conservation of native species threatened by hybridization (Allendorf et al, , Todesco et al, , Grabenstein & Taylor, ). Historically, understanding threats to native species by hybridization has been complicated by the uncertain conservation value of hybridized populations (Allendorf et al, ; Allendorf et al, ), as well as ambiguity in the legal status of hybrids with ancestry from threatened or endangered species, especially in the U.S. under the Endangered Species Act (Knudsen et al, ; Lind‐Riehl, Mayer, Wellstead, & Gailing, ).…”

Section: Discussionmentioning

confidence: 99%

“…When species hybridize following a species introduction or anthropogenic disturbance, hybridization has the potential to threaten biodiversity. Negative effects of hybridization on native species can include genetic or demographic swamping (Buerkle, Wolf, & Rieseberg, ; Grabenstein & Taylor, ; Rhymer & Simberloff, ; Todesco et al, ; Wolf, Takebayashi, & Rieseberg, ), potentially leading to extinction or local extirpation of the native species. Hybrids can also compete with parental species, and in some cases have higher fitness (Fitzpatrick & Shaffer, ; Rieseberg, Archer, & Wayne, ).…”

Section: Introductionmentioning

confidence: 99%

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Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

et al. 2019

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Hybridization can profoundly affect the genomic composition and phenotypes of closely related species, and provides an opportunity to identify mechanisms that maintain reproductive isolation between species. Recent evidence suggests that hybridization outcomes within a species pair can vary across locations. However, we still do not know how variable outcomes of hybridization are across geographic replicates, and what mechanisms drive that variation. In this study, we described hybridization outcomes across 27 locations in the North Fork Shoshone River basin (Wyoming, USA) where native Yellowstone cutthroat trout and introduced rainbow trout co‐occur. We used genomic data and hierarchical Bayesian models to precisely identify ancestry of hybrid individuals. Hybridization outcomes varied across locations. In some locations, only rainbow trout and advanced backcrossed hybrids towards rainbow trout were present, while trout in other locations had a broader range of ancestry, including both parental species and first‐generation hybrids. Later‐generation intermediate hybrids were rare relative to backcrossed hybrids and rainbow trout individuals. Using an individual‐based simulation, we found that outcomes of hybridization in the North Fork Shoshone River basin deviate substantially from what we would expect under null expectations of random mating and no selection against hybrids. Since this deviation implies that some mechanisms of reproductive isolation function to maintain parental taxa and a diversity of hybrid types, we then modelled hybridization outcomes as a function of environmental variables and stocking history that are likely to affect prezygotic barriers to hybridization. Variables associated with history of fish stocking were the strongest predictors of hybridization outcomes, followed by environmental variables that might affect overlap in spawning time and location.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

et al. 2019

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“…Before any other, one major factor that comes to mind to explain variable hybrid rates may involve the presence and the relative abundance of both species (Hubbs, 1955;Lepais et al, 2009;Rhymer & Simberloff, 1996) in the considered river system. Intuitively, a lack of conspecific partners would increase the chance that an individual will mate with a heterospecific partner and favor the introgression of alleles from the most abundant species (Currat, Ruedi, Petit, & Excoffier, 2008 (Grabenstein & Taylor, 2018) between A. alosa and A. fallax. Clearly, a reduced distance between species spawning grounds induced by obstacles increases chances of interspecific mating (Hasselman et al, 2014).…”

Section: Geographical Patterns Of Hybridizationmentioning

confidence: 99%

Variable outcomes of hybridization between declining Alosa alosa and Alosa fallax

Taillebois¹,

Sabatino

Manicki³

et al. 2019

Evolutionary Applications

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Hybridization dynamics between co‐occurring species in environments where human‐mediated changes take place are important to quantify for furthering our understanding of human impacts on species evolution and for informing management. The allis shad Alosa alosa (Linnaeus, 1758) and twaite shad Alosa fallax (Lacépède, 1803), two clupeids sister species, have been severely impacted by human activities across Europe. The shrinkage of A. alosa distribution range along with the decline of the remaining populations' abundance threatens its persistence. The main objective was to evaluate the extent of hybridization and introgression between those interacting species. We developed a set of 77 species‐specific SNP loci that allowed a better resolution than morphological traits as they enabled the detection of hybrids up to the third generation. Variable rates of contemporary hybridization and introgression patterns were detected in 12 studied sites across the French Atlantic coast. Mitochondrial markers revealed a cyto‐nuclear discordance almost invariably involving A. alosa individuals with an A. fallax mitochondrial DNA and provided evidence of historical asymmetric introgression. Overall, contemporary and historical introgression revealed by nuclear and mitochondrial markers strongly suggests that a transfer of genes occurs from A. fallax toward A. alosa genome since at least four generations. Moreover, the outcomes of introgression greatly depend on the catchments where local processes are thought to occur. Undoubtedly, interspecific interaction and gene flow should not be overlooked when considering the management of those species.

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“…Isolation in allopatry is a primary driver of population divergence and speciation. Divergent allopatric taxa, however, can be reunited as a result of anthropogenic habitat changes (Grabenstein & Taylor, 2018;Lehman et al, 1991;Seehausen, Takimoto, Roy, & Jokela, 2008;Steeves et al, 2010), species introductions (Fitzpatrick et al, 2010;Perry, Lodge, & Feder, 2002), or natural range dynamics (Bernatchez & Wilson, 1998). In secondary contact, any differences that confer reproductive isolation accrued in the allopatric populations may lead to reinforcement of taxon boundaries (Coyne & Orr, 1989).…”

Section: Introductionmentioning

confidence: 99%

Evolutionary dynamics of hybridization and introgression following the recent colonization of Glossy Ibis (Aves: Plegadis falcinellus) into the New World

et al. 2019

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Geographic range shifts can cause secondary contact and hybridization between closely related species, revealing mechanisms of species formation and integrity. These dynamics typically play out in restricted geographic regions, but highly vagile species may experience major distributional changes resulting in broad areas of contact. The Glossy Ibis (Plegadis falcinellus) is a dispersive waterbird of the Old World and Australia that colonized eastern North America in the early 19th century and came into contact with the native White‐faced Ibis (P. chihi). Putative hybrids between the two species have been observed across North America. To examine the population genomic consequences of this natural invasion, we sequenced 4,616 ultraconserved elements from 66 individuals sampled across the distributions of falcinellus, chihi, and the Puna Ibis (P. ridgwayi) of South America. We found genomic differentiation among the three species. Loci with high sequence divergence were often shared across all pairwise species comparisons, were associated with regions of high nucleotide diversity, and were concentrated on the Z chromosome. We detected signals of genetic admixture between chihi and falcinellus in individuals both near and far from their core area of sympatry. Genomic cline analyses revealed evidence of greater introgression into falcinellus from chihi, but we found little evidence for selection against hybrids. We also found signals of admixture between ridgwayi and South American populations of chihi. Our results indicate vagile species can experience pervasive introgression upon secondary contact, although we suggest these dynamics may be more ephemeral than the stable hybrid zones often observed in less dispersive organisms.

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Breaking Barriers: Causes, Consequences, and Experimental Utility of Human-Mediated Hybridization

Cited by 172 publications

References 108 publications

Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

Variable hybridization outcomes in trout are predicted by historical fish stocking and environmental context

Variable outcomes of hybridization between declining Alosa alosa and Alosa fallax

Evolutionary dynamics of hybridization and introgression following the recent colonization of Glossy Ibis (Aves: Plegadis falcinellus) into the New World

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